Ubuntu HowTo: how change kde plasma scrollbar width

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How can I change the scrollbar width in kde plasma 5.9.4 ubuntu 17.04. The Application Style dialog box no longer contains this setting. I’m old and they are too small.

I don’t know about 17.04, but in 18.04 you can select the Oxygen style, which has a setting for the scrollbar width. The default Breeze does not.

For gtk applications I created my own theme in ~/.themes based on an existing one in /usr/share/themes and modified gtk.css to make the scrollbar larger. This is easier with gtk-3.20 than with previous versions, you just have to increase some min-width in the Scrollbars section, and optionally the border-radius. In 3.18 and earlier you have to increase the stretch dimensions for many elements, in the same file.

Still, I wish developers would just use at least 20 pixels for a scrollbar by default, it’s not too much out of 1920 pixels and these are well spent pixels…

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Ubuntu HowTo: How to change highlight color of windows on taskbar in KDE Plasma 5?

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Currently windows on panel’s taskbar panel highlighted by blue by default, how could I change that color without changing the entire theme (can’t find).

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Various colors can be changed via System Settings.

  • Under Workspace Theme, make a note of the themes that are active in Look and Feel and Desktop Theme.
  • Go back to the opening screen of System Settings and click on Colors.
  • Under Application Color Scheme, click on the name of the scheme you have as active in Look and Feel.
  • Below the list of themes, click Edit Scheme.
  • Ensuring that you haven’t changed the Color set from Common Colors, scroll down till you come to Hover Decoration.
  • Click on the existing color to open a color chooser palette. Here, select the color you want and click Okay.
  • Click Apply and Save. At this point, to avoid overwriting the original scheme, give another name for your scheme.
  • Close the window.
  • Now, click on the scheme you created and then click Apply once again. That’s important!

Note that:

  • you haven’t really changed the entire scheme. Your changes are stored in a small file in ~/.local/share/color-schemes with the scheme name you gave earlier and a .color suffix.
  • more than one visual aspect may be affected by the change you make. It will not be limited to just the taskbar.

As you get more familiar with things you can make many more changes to suit your visual needs.

Changing colors - 1

Changigng colors -2

Please accept this updated answer for a newer version of KDE, I’m not sure from which version it started, but this applies to KDE Plasma 5.18.5 (which I’m running), via GUI:

  1. There’s now a Colors section in System Settings – go there.

    To find it:

    • Go to to System Settings > Apperance > Colors

    Or

    • Search in `System Settings for “Colors”.
  2. Highlight (with mouseover) your current color scheme. An edit button will appear (if you hover on it it’ll say “Edit Color Scheme”)

  3. Click on the edit button. It’ll open up the KColorSchemeEditor color scheme editor.

  4. Make sure you’re in the Colors tab (should be the default tab opened).

  5. Scroll to look for “Hover Decoration” and then click on the color box.

  6. A color selection tool should appear. Select your desired color.

  7. Click on OK – it should auto-close the color selecton tool

  8. In KColorSchemeEditor click on the Apply button. It shouldn’t auto-close the window but you can close it manually by clicking on the Close buton.

  9. Then, back in Colors, click on the Apply button. Again, it won’t auto-close the indow, but you can close it manually by clicking on the close button.

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